You dont want to be blowing your sand around. Ways to fix this include moving the powerhead directing it up more away from the sand or my favorite which includes using a larger grain sand. Super fine .5-1micron sand is hard to work with. It blows around easier and is harder to siphon.
For the easy fix just adjust the powerhead away from the sand a little.
29g Mixed Reef, 150w 14k Phoenix MH w/ Moonlights, Reef Octopus BH1000 HOB Skimmer, Ecotech Vortech MP10es, ReefKeeper Lite (Plus), PH Probe, Temp Probe, ATO, Carbon/GFO Reactor.